The Strategic Defense Coalition, or SDC, is a faction in Call of Duty: Black Ops II. They are an East Asian Chinese-led strategic military alliance. This is one of the largest military alliances in the world during the Second Cold War after NATO.

If the player succeeds in all of the Strike Force missions, the SDC will ally with JSOC and they will send their drones to defend the U.S.S. Barack Obama from Menendez's drone attacks in the mission "Odysseus" and will also send elite troops to eliminate Cordis Diemercenary snipers in the final mission "Judgment Day."

If the player fails in one or all of the Strike Force missions, the SDC will invade Russia and make them join the coalition. With this, the Chinese Army will be under Chairman Zhao's orders and Premier Chen can't support the JSOC and their allies and he will be mad during the introduction cutscene of "Cordis Die" and blame the Americans for the drone invasion, which resulted of having a bad relationship with China.

Judging by the holographic map in the briefing before the start of the Strike Force mission, SDC has a considerable amount of members from different countries. Section also stated that if Russia joined the SDC, they would be the single largest military alliance on the planet.

Given the number of SDC troops stationed there, Pakistan appears to have some degree of close relations or alliance with China. It is unknown if Pakistan is either an observer, dialogue partner, or has applied for membership.

They also appear as a faction in multiplayer, always opposing SEAL Team Six.